Touch screen panel
A touch screen panel provided in an image display device. The touch screen panel includes: a transparent substrate; a plurality of first sensing patterns on the transparent substrate and coupled to each other along a first direction; a first insulating film on the first sensing patterns; a plurality of second sensing patterns on the first insulating film and coupled to each other along a second direction, the first and second sensing patterns being alternately arranged not to overlap with each other; and a second insulating film on the second sensing patterns, wherein the first insulating film and the second insulating film are composed of materials having different optical refractive indexes.
1. A touch screen panel comprising:
a transparent substrate;
a plurality of first sensing patterns on the transparent substrate and coupled to each other along a first direction;
a first insulating film on the first sensing patterns;
a plurality of second sensing patterns on the first insulating film and coupled to each other along a second direction crossing the first direction, the second sensing patterns being alternately arranged with the first sensing patterns to not overlap with the first sensing patterns; and
a second insulating film on the second sensing patterns,
wherein the first insulating film and the second insulating film are composed of materials having different optical refractive indexes, and
wherein the first insulating film is composed of a material having an optical refractive index greater than that of the second insulating film.
2. The touch screen panel as claimed in claim 1 , wherein the first sensing patterns are composed of ITO, and the first insulating film is composed of a material having an optical refractive index between about 1.7 and about 1.8.
3. The touch screen panel as claimed in claim 2 , wherein the second sensing patterns are composed of a material having an optical refractive index between about 1.5 and about 1.65.
4. The touch screen panel as claimed in claim 1 , wherein the second insulating film is composed of a material having an optical refractive index between the optical refractive index of air and the optical refractive index of the first insulating film.
5. The touch screen panel as claimed in claim 1 , wherein the first sensing patterns are composed of ITO, and the first insulating film is composed of a transparent insulating material comprising between about 10 and about 30 wt % of SiO2, between about 5 and about 30 wt % of ZrO2, between about 1 and about 60 wt % of TiO2.
6. The touch screen panel as claimed in claim 5 , wherein the transparent insulating material of the first insulating film is composed of about 30 wt % of SiO2, about 10 of wt % ZrO2, and about 60 wt % of TiO2.
7. The touch screen panel as claimed in claim 6 , wherein the second insulating film is composed of a transparent insulating material having a composition of about 20 wt % of SiO2, about 10 wt % of ZrO2, about 50 wt % of TiO2, and about 20 wt % of SiO2 filler.
8. The touch screen panel as claimed in claim 1 , wherein the second insulating film has a surface roughness greater than that of the first insulating film.